I have a knowledge of science and have been hard pressed to find an answer.I thought could smoking have any effect,that theory was discarded almost immediately.

I do believe I found an answer to it.I use a wax called Nu Finish,a once a year car wax or so they say.Im convinced this is the culprit.I spoke with a friend who drives a KIA,who also uses that same wax and he said the same thing.....